US Bridges

18 Mile Road over W Br Chippewa River

Good

Mecosta County, Michigan · 1.4 MI W of M-66 · Structure no. 000000000006770

Built
2023
2 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
351
2022 count
Owner
County
County Highway Agency

About this bridge

18 Mile Road over W Br Chippewa River is a prestressed concrete box beam or girders - single or spread carrying 18 Mile Road over W Br Chippewa River in Mecosta County, Michigan. It was built in 2023, so it is 2 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 351 vehicles a day, roughly 2% of them trucks, projected to reach 428 by 2042. The structure is 50 ft (15.2 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries18 Mile Road
CrossesW Br Chippewa River
Location1.4 MI W of M-66
RouteCounty Highway 0
CountyMecosta County
StateMichigan
Coordinates43.72708, -85.17504
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.2 US tons
Inventory rating63.9 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length50 ft (15.2 m)
Longest span48 ft (14.5 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic351 (2022)
Projected traffic428 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 18 Mile Road over W Br Chippewa River built?

It was built in 2023, making it 2 years old in 2025.

What condition is 18 Mile Road over W Br Chippewa River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does 18 Mile Road over W Br Chippewa River carry?

About 351 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 18 Mile Road over W Br Chippewa River?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.5 m) and a deck 35 ft wide.

Who owns 18 Mile Road over W Br Chippewa River?

It is owned by the County Highway Agency.